Glass lily pipes need pushing inwards with a twist to release. It breaks the seal from tight contact and usually water and biofilm flood in to lubricate the release from each other.
Had plastic fittings from Eheim that have been so well stuck to piping, only developing Tourette’s followed by cutting the piping off with a Stanley knife has worked.
The Eheim double taps have twist locks holding the pipe in place, so wouldn’t be so worried about using silicone spray on those to aid in dismantling them. The locking nut also holds them together on the barb.
However, if its plastic/stainless steel inlet/outlets you use then there’s nothing to clean with bleach compared to glass lily’s. The best use of the double taps with plastic/stainless is to create short enough sections that can uncouple, then be cleaned with a pipe brush whilst stuck together. Most easily done submerged in a bath of warm water. Takes seconds to dismantle and reassemble, shortening the time the filter is off on your tank.
I’d use double taps but they are expensive now and I already have a pair of singles.
Eheim double taps have always been expensive, but have a pair that have been on every tank. Like their classic filters, they will end up in your final will. They don’t break thanks to quality thermoset plastic, so good value for money and appear to last decades without any special treatment.
